Malicious PDF — malware analysis report

Static analysis result for SHA-256 daeb9ba8ce84be6a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 17:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0b7ddbfedc2d104c6c7d6647ffab8e0 SHA-1: baddb92061bffb218bf5642f8c196eec442ad494 SHA-256: daeb9ba8ce84be6a3bf11654e17408a6ffffd5c46415a90744ab5204689a754b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://luligang.com/ckfinder/userfiles/files/70098781987.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/pesivovisutew.pdf
    • http://rzn-house.ru/upload/file/pixusol.pdf
    • http://xingyeknitting.com/userfiles/files/87083711884.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131feacb79d6---dulekizisanalazesu.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130033690539---91539785175.pdf
    • https://myclubowners.travelenvogue.com/userfiles/files/jutarodonusuzubowoxudez.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6bf7d45f3---kejewatotipobeperabulev.pdf
    • http://bentleyplemtech.ru/userfiles/file/poxar.pdf
    • http://vom-ragnaroek.de/uploads/file/6956171950.pdf
    • https://pmeds.us/userfiles/file/laxub.pdf
    • http://joyearland.com/ckfinder/userfiles/files/kunomizitezule.pdf
    • http://sarkar.ie/userfiles/file/90500624323.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/82526834355.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xadefiwefuvotasolaremik.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c79fb87daf88dc11bd1b07bce4e8b9c8/semiwasa.pdf
    • http://heryeryesil.com/resimlerfiles/vobizubupimop.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/fesavezedabaguwe.pdf
    • http://thietbimaugiao.vn/Images_upload/files/79324711509.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/73f24ec898dacface22db1ad2b7fa2b0/peneneligasokesexikem.pdf
    • http://dsfly.com/uploads/files/46081769218.pdf
    • https://sproname.com/files/userfiles/files/xosovewokut.pdf
    • https://bankubezpieczen.pl/userfiles/file/togawupujuwajul.pdf
    • https://rwd1.thadv.com/upload/files/38382653144.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=analysis+of+algorithms+sedgewick
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47a.bin
ebd03a34915e2ceb2c8996c91ee0737c919d4d71501c7f7bc52ba89efe4d323b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 18024 bytes
font_01_sfnt_off0001034d.bin
0d34f606dd6c17434bbb4c44da8ee6c2439e8eaf0ce84fce3522abe95dfe1f4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 11196 bytes
font_02_sfnt_off00011d41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16792 bytes